I am in Eastern VA.
WVKL is very repetitious and Z-104 would play excessive repeats.
Well, those are both current hit-based stations. And stations like that have always had tight rotations. Even in the 60s, Top 40 stations were playing the six or seven biggest hits every hour and 40 minutes. Less popular songs, on their way up or down the chart, were generally played between every two hours and 10 minutes to every four hours or so.
By the 70s, many of the most successful stations (WABC, KCBQ) were playing their hottest current records every hour and ten minutes.
"Excessive" is in the ear of the behearer. Looking at the latest Norfolk-Virginia Beach-Newport News Nielsen Audio ratings, WVKL is a consistent number one month after month, usually at least three points ahead of the number two station in the market.
Z104 is lower-ranked, but is on an upward trend that could put it in the top ten if it continues.